When the speed of bicycle wheel is increased then
- Magnetic flux is increase
- The amount of induced current also increases.
When a current carrying conduct is kept in a magnetic field the conductor moves, if it is allowed to do so. This is called motor effect.
A bottle dynamo or sidewall dynamo is a small electrical generator for bicycles employed to power a bicycle's lights. ... When the bicycle is in motion and the dynamo roller is engaged, electricity is generated as the tire spins the roller.
A bicycle dynamo works by converting the mechanical motion of the rotating wheel into electrical motion with the use of a magnet. The dynamo contains a permanent magnet wound with coils of insulated wire. When the magnet rotates, it creates a changing magnetic field, which generates electricity in the wire.In theory all bicycle dynamo* outputs are AC. ... If it lit up on both tries, it's AC. If it lit up on only one try, it's DC. *Although bicycle dynamos are called dynamos, they are in fact alternators.Standard bike dynamos produce 3 watt 6 volts. That's not a lot of power but 12 hours of cycling should charge a 36 watt hour battery.
dynamo can be used to charge any battery of 12 volts .